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Sanctum 2
Sanctum 2 is the sequel to the world’s first Tower Defense/FPS hybrid game. Pick from four unique character classes and embark on a mission to protect the oxygen-producing Cores from hordes of deadly aliens who are threatened by their existence.
Super Sanctum TD
Super Sanctum TD is a retro-styled Tower Defense game that focuses on strategy, customization and replayability. Build advanced mazes and construct powerful towers to prevent alien hordes from reaching the Core!
Surgeon Simulator
Surgeon Simulator is an over-the-top operation sim, stitching together pitch-black humour with life-saving surgery. Become Dr. Burke, a would-be surgeon with a less than conventional toolkit, as he performs procedures on patients including the Heavy from TF2! ...is that a hammer?
Another World 20th Anniversary Edition
Also known as Out Of This World™, Another World is a pioneer action/platformer that released across more than a dozen platforms since its debut in 1991. Along the years, Another World™ has attained cult status among critics and sophisticated gamers alike.
Weird Worlds: Return to Infinite Space
Weird Worlds: Return to Infinite Space is a hybrid roguelike game of space exploration, adventure and starship combat.
Incredipede
Grow arms and legs to transform into a snake, spider, butterfly, or fifty-legged horror - anything you can imagine. Control your creations in a fumblecore dash to solve each puzzle. Learn to swing through the trees, climb sheer cliffs, or even fly.
Star Conflict
Star Conflict is an action-packed, massively multiplayer space simulation game that puts players in the role of elite pilots engaging in a widespread interplanetary skirmish. The whole world for PVP and PVE!
Sword of the Stars: The Pit
A fun, fast, light-hearted, turn-based RPG, where the tradition of old school dungeon-diving games meets the sci-fi Sword of the Stars universe!
Natural Selection 2
A fast paced multiplayer shooter that pits aliens against humans in a strategic and action-packed struggle for survival!
XCOM: Enemy Unknown
The XCOM: Enemy Unknown - Slingshot Pack is Now Available!
ENDLESS Space - Definitive Edition
ENDLESS Space™ is a turn-based 4X strategy game, covering the space colonization age in the ENDLESS Universe™, where you can control every aspect of your civilization as you strive for galactic domination.
Alien Shooter 2 Conscription
The Great War has begun! The world population capable of functioning is mobilized to serve in the army and the outcome depends on you!
Aliens: Colonial Marines Collection
You & your friends are the deadliest killers in the galaxy – the US Colonial Marines. It’s up to you to not just survive, but wipe out the Xeno infestation.
Warp
Warp™ is a strategic stealth-action puzzler where gamers play as Zero, a loveable yet lethal, little orange alien with a big score to settle. Abducted by a villainous General from his home world and taken to an underwater research facility, Zero must plan his ultimate escape by relying on his arsenal of special abilities.
Unstoppable Gorg
Defend the solar system from fearsome aliens by sending satellites into orbit in revolutionary tower defense action!
Earth Defense Force: Insect Armageddon
Thousands of giant insects and aliens once again ravage the earth, and only the Earth Defense Force can stop them.
Galactic Civilizations II: Ultimate Edition
Get the complete GalCiv II saga including Galactic Civilizations II: Dread Lords, the expansion pack Dark Avatar, and the newest expansion pack Twilight of the Arnor!
Serious Sam 3: BFE
Serious Sam 3: BFE is a prequel to the original indie fast action FPS and Game of the Year sensation - Serious Sam: The First Encounter!
Sins of a Solar Empire: Trinity
In Sins of a Solar Empire: Trinity, you are the leader of a civilization embroiled in a galactic war, fighting for the survival of your entire race against relentless foes.
Alien Hallway
Players measure stamina with a never-ending stream of green creatures within the borders of a special military mission.
Quake 4
As part of the elite Rhino Squad, you must spearhead Earth’s military invasion of a hostile alien homeworld. But, in this desperate war for humanity’s survival against an unrelenting enemy, you may discover that the only way to defeat them...is to become one of them.
Duke Nukem Forever
The King arrives with an arsenal of over-the-top weapons, giant explosions and pure unadulterated fun!
Red Faction : Armageddon
Red Faction: Armageddon Path to War includes 4 new missions, 2 unlockable items and 10 new achievements!
Anomaly: Warzone Earth
Lead an armored squad through the perils of this reversed tower defense action-strategy game!
Crysis 2 - Maximum Edition
Aliens are decimating New York City, only you have the technology to survive. Be The Weapon.
Revenge of the Titans
The ultimate mash-up of Real-time Strategy and Tower Defense!
Dead Space 2
Three years after the Necromorph infestation aboard the USS Ishimura, Isaac Clarke awakens from a coma, confused, disoriented, and on a space station called The Sprawl. Explore this world and its zero-g environments to discover the truth about the Unitology and its role in the Necromorph epidemic.
Alien Breed 3: Descent
Experience the final explosive chapter in the Alien Breed series and uncover the horrifying truth surrounding the existence of the Breed. Launch discount good thru Nov. 24 10am PST.
Lost Planet 2
Lost Planet 2, the sequel to Lost Planet™: Extreme Condition, the landmark third-person shooter that sold over 2.3 million units worldwide, is now available on Steam!
Alien Breed 2: Assault
Can you survive the alien onslaught? Gamers across the world will now have a chance to play the next chapter in this high-budget, high-quality series.
Alien Swarm
Co-operative multiplayer game and complete code base available for free.
Alien Breed: Impact
Experience the explosive science fiction arcade-shooter that resurrects a much revered franchise in an epic single player and co-op multiplayer campaign.
Serious Sam HD: The Second Encounter
Serious Sam HD: The Second Encounter is a visually upgraded and fully Steam supported remake of the original high-adrenaline single-play and 16-player co-operative arcade-action FPS and Gamespot's Game of the Month!
Aliens vs. Predator
Survive, hunt and prey in the deadly jungles and swamps in distinctly new and thrilling first person gameplay.
Aliens versus Predator Classic 2000
Aliens Versus Predator Classic 2000 features the Colonial Marine, Alien and Predator Campaigns and the frenetic single-player Skirmish mode from the original title: Alien Versus Predator Gold Edition, which was released to massive acclaim in 2000.
Samorost 2
Samorost 2 tells a surreal story of a space gnome whose dog just got kidnapped by mischievous aliens. Set out on a short expedition to rescue the pup, deal with curious strangers and relax to the soothing music by Tomáš "Floex" Dvořák.